QSFP-DD-4xSN_Optical Transceivers – 1000×1000


Smartoptics QSFP-DD transceivers give you the flexibility to both run 400G links and low-cost 100G.

The need for 400G QSFP-DD transceivers

QSFP-DD transceivers (DD = Double Density) have become the most popular form factor for 400G due to their size and efficiency compared to competing solutions in OSFP or CFP2 formats. The demand for 400G connectivity is driven by the tremendous requirement for high bandwidth in metro-/regional networks and cloud data center interconnects.

Smartoptics range of QSFP-DD transceivers

Smartoptics has several varieties of QSFP-DD transceivers for different use cases. Some of the most popular options are:

  • 400G-DR4: up to 500m on singlemode ribbon fiber.
  • 400G-FR4: up to 2km on singlemode ribbon or duplex fiber.
  • 400G-LR4: up to 10km on singlemode ribbon or duplex fiber.
  • Coherent 400G: up to 450km over DWDM.

All three R4 QSFP-DD transceiver types can be used for 400 to 4x 100G break-out applications where four 100G transceivers are combined with the same type of 400G transceiver (DR4, FR4 or LR4).

Coherent 400G QSFP-DD transceivers are the only type with DWDM support, making them a perfect match for ROADM-based architectures. They can also be used with duplex LX connectors.


QSFP-DD Direct Attach Copper (DAC) cables provide a complete cable assembly instead of discrete components for short-distance connectivity. QSFP-DD Active Optical Cables (AOCs) are also complete cable assemblies but use real transceivers and are suitable for longer distances.

Selected Smartoptics 400G QSFP-DD transceiver benefits

  • 200G with 16QAM modulation for applications in 50GHz spaced filters
  • OTN capable versions, from 100G up to 400G
  • Support for Encrypted 400G services using AES-256 encryption
  • Pluggable compact form factor
  • Interoperable with major switch vendors
  • Support for 4x 100G breakout applications
  • For distances ranging from within a data center to metro, regional and long-haul
  • Enhanced digital diagnostic information via I2C interface
  • Multi-source agreement (MSA) compliant


Learn more about Smartoptics QSFP-DD transceivers

Download the overview datasheet for QSFP-DD transceivers, or browse all our transceivers, AOC and DAC cable assemblies.

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Why smartoptics

Expand your network horizons

At Smartoptics, we believe strongly in an open approach, smart design principles, ambitious customer service and sustainable solutions.


Committed to open solutions with no lock-in using latest open standards and an open culture of honesty.


Innovating smart design principles for plug-and-play, future-proof and scalable networking solutions.


Going the extra mile with in-house expert support and strong focus on customer satisfaction (NPS 82).


Doing our part with long product lifecycles, small footprints and energy efficiency optimizations.